At one time, Dolby Noise Reduction units were used in studios to reduce noise with analog tape. But they also were used on a lot of background vocals to give an airy, bright sound by encoding with Dolby (usually type A) while recording, but not decoding on playback. What Dolby did was compress above a certain frequency and add pre-emphasis, which is ideal for souping up a vocal's intelligibility. It's not all that easy to find old Dolby units, but when you do, they tend to be dirt cheap
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It adds that amazing "air" to the vocals (ala deff leppard), and you can use it for bass, acoustic guitars, snare drum, almost anything.
After using the dolby for vocals, you dont need to eq it at all, it just sounds wonderfull.
I've seen a lot of "armonic exiters" and stuff like that in focusrite preamps and etc, but they dont sound like the dolby, its a unique sound!
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Don't mistake me for a techy guy, but at one point I was interested in a 301 and liked the fact that you could pull the low end card out to disable processing on that band. You can disable the low end processing of that 361 model, the info I'm posting below will net you identical results with a 301 (the original Dolby A), same as pulling the low end card.
An old email response I received from them:
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Hello -
It is indeed theoretically possible to disable the low-frequency band ("band 1") of a model 360 or 361, but it means getting at the edge-connector into which the Cat.No.22 noise reduction module plugs.
With the top cover removed, and looking from above and from the front, the lower pins are numbered 1 to 16 from left to right. The upper layer is lettered A to T (omitting I and round letters, that is G, O and Q), again left to right. To disable band 1, you need to connect a link between pin F (6th from left) and pin T (ground, at the right hand end). Incidentally, bands 2, 3 and 4 are pins J, M and S.
In addition, in case it is useful, the output impedance at those pins is 2K2, so if instead of a wire you connect a suitable resistor (or even a potentiometer) from a pin to ground, you reduce the degree of compression in that band.
Finally, I strongly recommend that any links or resistors be connected to the edge-connector socket, not to the corresponding fingers on the plug-in module, because it is all to easy to ruin the module.
I hope this may be helpful.
regards
Dolby Customer Support